var external_check_uris = new Array(
	"www.revolution-und-einheit.de",
	"www.friedliche-revolution.de",
	"http://revolution-und-einheit.de",
	"http://friedliche-revolution.de",
	"revolution-und-einheit.de",
	"friedliche-revolution.de",
	"friedlicherevolution.de",
	"www.friedlicherevolution.de",
	"http://friedlicherevolution.de",
	"www.revolutionundeinheit.de",
	"revolutionundeinheit.de",
	"http://revolutionundeinheit.de"
);

var external_check_container_id = "external_check_notice";

function show_external_check_notice(){
	document.getElementById(external_check_container_id).style.display = "block";
	return false;
}

function hide_external_check_notice(){
	document.getElementById(external_check_container_id).style.display = "none";
	return false;
}



function external_check(){
	if(document.referrer){
		var external = true;
		for(var i=0;i<external_check_uris.length;i++){
			if(document.referrer.match(external_check_uris[i])){
				external = false;
			}
		}
		if(external==true){
			show_external_check_notice();
		}else{
			hide_external_check_notice();
		}
	}else{
		show_external_check_notice();
	}
}

function addEvent(obj, evType, fn){ 
	if (obj.addEventListener){ 
		obj.addEventListener(evType, fn, false); 
		return true; 
	} else if (obj.attachEvent){ 
		var r = obj.attachEvent("on"+evType, fn); 
		return r; 
	} else { 
		return false; 
	} 
}

addEvent(window, 'load', external_check);